Built to complement Essential Organic Chemistryas part of an integrated course package, the easy-to-use Companion Website features the following modules for each chapter: *Interactive Tutorials and Animation Galleries highlight central concepts and illustrate key mechanisms. The Tutorials often allow the student to make incorrect choices and then explain why there is a better answer. *Molecule Galleries feature hundreds of 3-D molecular models of compounds. Students can rotate and compare models, change their representation, and examine electrostatic potential map surfaces -- a unique feature of learning organic chemistry on the Web. *Practice Exercises and Quizzes offer new exercises to test the student's understanding of the material. Each question includes a hint with a cross-reference to a text reading and detailed feedback.